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Asterisk - An open source telephony switching and private branch exchange service for Linux.
YateClient - YateClient is an Instant Messenger and a SoftPhone.
FreeSWITCH - FreeSWITCH is an open-source media application designed to support popular protools such as SIP and WebRTC and provides a platform to develop voice and video applications.
Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
freepbx - FreePBX is a web-based open source GUI that controls and manages Asterisk (PBX).
MicroSIP - MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack.